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English definition of “stiffen”

stiffen

verb [I] (LESS RELAXED)    /ˈstɪf.ən/
to become less relaxed and more formal: She stiffened when her former husband walked into the room.Tight and tightening
(Definition of stiffen verb (LESS RELAXED) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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